1. An electrical connector to be attached to a circuit board, comprising:
a terminal having a contact section on one free end side to contact with a terminal of a mating connector and a connecting section on the other free end side to be connected by soldering to a circuit portion of the circuit board, said terminal having a holding section to be held by contacting to a wall section of a housing orthogonal to a surface of a circuit board in a middle part of the terminal, said terminal having a connecting section formed by bending a lower end of the holding section and extending along a circuit board surface, said holding section having a face-contact section that contacts by face with the wall section, a backside section on the other side to the face-contact section, and a side-face section connecting between the face-contact section and the backside section, said terminal having a low solder wetting area at least on a part of a circumferential area of the holding section in a longitudinal direction except the contact section and the connecting section, said contact section being formed above an upper end of the low solder wetting area on the backside section, said upper end of the low solder wetting area on the backside section being provided below the upper end at the side-face section and the contact-face section.
2. The electrical connector according to claim 1, wherein said low solder wetting area of the terminal has a lower end at a bent section transitioning from the holding section to the connecting section.
3. The electrical connector according to claim 1, wherein said low solder wetting area of the terminal is formed as an exposed low solder wetting material layer, after applying a high solder wetting material layer as an upper layer on a low solder wetting material layer as a base layer over a whole terminal base material, when the high solder wetting material layer is removed or dissolved in an area that corresponds to the low solder wetting area so that the low solder wetting material layer is exposed as the exposed low solder wetting material layer.
4. The electrical connector according to claim 1, wherein said high solder wetting area is formed by gold plating and said low solder wetting area is formed by nickel plating, respectively.
5. The electrical connector according to claim 3, wherein said low solder wetting area is formed by removing or dissolving the high solder wetting material layer by irradiation of laser beam.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sucker, comprising:
a sucker body; wherein:
the sucker body includes a rough suction layer;
the rough suction layer of the sucker body includes a plurality of protrusions which are juxtaposed to each other closely, and a plurality of grooves defined between the protrusions;
when the rough suction layer of the sucker body presses an attached face and is disposed at a negative pressure state, the sucker body is pressed toward the attached face by a normal force from the ambient air, so that the rough suction layer of the sucker body is compressed, and the grooves of the rough suction layer form multiple independent negative pressure or vacuum zones, to increase a negative pressure of the rough suction layer, to decrease air existing in the rough suction layer of the sucker body, and to reduce a vacuum leak in the rough suction layer of the sucker body, so as to increase an air-tightness between the rough suction layer of the sucker body and the attached face; and
the rough suction layer of the sucker body is bonded onto the attached face closely and tightly so that when the attached face is an unsmooth or cracked face, the rough suction layer of the sucker body will not be detached from the attached face.
2. The sucker of claim 1, wherein the rough suction layer of the sucker body has a planar shape and has a slightly adhesive feature.
3. The sucker of claim 1, wherein:
the protrusions of the rough suction layer are arranged in an annular shape; and
the protrusions of the rough suction layer are distributed and extended through a peripheral surface of the rough suction layer or a whole circumferential surface of the rough suction layer.
4. A sucker, comprising:
a sucker body; and
a driving mechanism connected with the sucker body; wherein:
the sucker body includes:
a rough suction layer;
a support layer combined with the rough suction layer;
a receiving chamber connected with the support layer;
a mounting seat connected with the support layer; and
an airtight control switch pivotally connected with the mounting seat;
the rough suction layer of the sucker body is made of soft material;
the support layer of the sucker body is made of hard material;
the rough suction layer of the sucker body includes a plurality of protrusions which are juxtaposed to each other closely, and a plurality of grooves defined between the protrusions;
the rough suction layer of the sucker body has a central portion provided with an air recess which has an air channel;
the receiving chamber of the sucker body is connected to the air channel of the rough suction layer;
the mounting seat of the sucker body has a bottom provided with an air hole;
the support layer of the sucker body has a side provided with a conduit connected between the air channel of the rough suction layer and the air hole of the mounting seat;
when the rough suction layer of the sucker body presses an attached face and is disposed at a negative pressure state, the sucker body is pressed toward the attached face by a normal force from the ambient air, so that the rough suction layer of the sucker body is compressed, and the grooves of the rough suction layer form multiple independent negative pressure or vacuum zones, to increase a negative pressure of the rough suction layer, to decrease air existing in the rough suction layer of the sucker body, and to reduce a vacuum leak in the rough suction layer of the sucker body, so as to increase an air-tightness between the rough suction layer of the sucker body and the attached face; and
the rough suction layer of the sucker body is bonded onto the attached face closely and tightly so that when the attached face is an unsmooth or cracked face, the rough suction layer of the sucker body will not be detached from the attached face.
5. The sucker of claim 4, wherein:
the driving mechanism is mounted on the receiving chamber of the sucker body and is connected to the air channel of the rough suction layer;
the driving mechanism is a pull-type air extraction mechanism and includes:
a valve movably mounted in the receiving chamber of the sucker body;
an airtight gasket mounted on the receiving chamber of the sucker body and pressing the airtight gasket; and
a pulling member connected with the valve.
6. The sucker of claim 4, wherein the driving mechanism is a pivotal handle type air extraction mechanism.